Michael, I hope your back feels better soon.
Pigeon English, thanks for the video. Shakhova is right; potential methane release was not included in the 2015 IPCC assessment. It has been included in the latest 2021 assessment; they have rated massive methane release as unlikely, but put new, much higher lines on the graphs for what they think would result if it did occur. But the IPCC have consistently underestimated things.
Let’s not count our vultures before they’ve hatched, eh? We try our best, get the emissions down, hopefully before the methyl hydrates blow.